Factors affecting compressive strength and expansion due to alkali-silica reaction of fly ash-based alkaline activated mortar
The development of environmentally friendly alkaline-activated materials (AAMs) holds promise, as AAMs can be derived from waste materials. This study aims to investigate the factors influencing (i) compressive strength and (ii) expansion due to alkali-silica reaction (ASR) in AAMs. These factors in...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-12-01
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| Series: | Case Studies in Construction Materials |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214509523007751 |
| _version_ | 1797454540908265472 |
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| author | Artith Wongpaun Weerachart Tangchirapat Teewara Suwan Mizi Fan |
| author_facet | Artith Wongpaun Weerachart Tangchirapat Teewara Suwan Mizi Fan |
| author_sort | Artith Wongpaun |
| collection | DOAJ |
| description | The development of environmentally friendly alkaline-activated materials (AAMs) holds promise, as AAMs can be derived from waste materials. This study aims to investigate the factors influencing (i) compressive strength and (ii) expansion due to alkali-silica reaction (ASR) in AAMs. These factors include alkaline concentration, heat curing conditions, fineness of fly ash, and the liquid alkaline-to-binder (L/B) ratio. The findings indicate that the higher concentrations of NaOH solution led to an increase in AAM compressive strength due to the enhanced dissolution and polymerization rates in a more alkaline environment. Heat curing stimulated chemical reactions and structure formation, while the reduced water content resulted in lower porosity and higher compressive strength in the hardened cement. Finer fly ash yielded greater compressive strength than coarser ash, as its smaller spherical particles contributed to denser and firmer structures. The presence of calcium minerals, from both Ordinary Portland Cement (OPC) and high-calcium fly ash, bolstered the strength of hardened products. Moreover, calcium minerals like CaO, Ca(OH)2, and CaSO4 were found to induce ASR expansion by promoting gel formation, leading to later-stage expansion in the hardened cement or concrete. However, finely milled fly ash as a precursor significantly reduced ASR expansion in AAMs, by approximately 40% compared to ordinary Portland cement. This study provides valuable insights for civil engineers for better understanding of AAM behavior and makes contributions to the safety and sustainability of cement and concrete systems. |
| first_indexed | 2024-03-09T15:38:38Z |
| format | Article |
| id | doaj.art-10061de14b87419bb2919bfb93cc60ca |
| institution | Directory Open Access Journal |
| issn | 2214-5095 |
| language | English |
| last_indexed | 2024-03-09T15:38:38Z |
| publishDate | 2023-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Construction Materials |
| spelling | doaj.art-10061de14b87419bb2919bfb93cc60ca2023-11-25T04:49:25ZengElsevierCase Studies in Construction Materials2214-50952023-12-0119e02595Factors affecting compressive strength and expansion due to alkali-silica reaction of fly ash-based alkaline activated mortarArtith Wongpaun0Weerachart Tangchirapat1Teewara Suwan2Mizi Fan3Construction Innovations and Future Infrastructures Research Center (CIFIR), Department of Civil Engineering, Faculty of Engineering, King Mongkut’s University of Technology Thonburi, Bangkok 10140, ThailandConstruction Innovations and Future Infrastructures Research Center (CIFIR), Department of Civil Engineering, Faculty of Engineering, King Mongkut’s University of Technology Thonburi, Bangkok 10140, ThailandChiang Mai University Advanced Railway Civil and Foundation Engineering Center, (CMU-RailCFC), Department of Civil Engineering, Faculty of Engineering, Chiang Mai University, Chiang Mai, 50200, Thailand; Corresponding author.Department of Civil and Environmental Engineering, College of Engineering, Design and Physical Sciences, Brunel University, Uxbridge, London UB8 3PH, UKThe development of environmentally friendly alkaline-activated materials (AAMs) holds promise, as AAMs can be derived from waste materials. This study aims to investigate the factors influencing (i) compressive strength and (ii) expansion due to alkali-silica reaction (ASR) in AAMs. These factors include alkaline concentration, heat curing conditions, fineness of fly ash, and the liquid alkaline-to-binder (L/B) ratio. The findings indicate that the higher concentrations of NaOH solution led to an increase in AAM compressive strength due to the enhanced dissolution and polymerization rates in a more alkaline environment. Heat curing stimulated chemical reactions and structure formation, while the reduced water content resulted in lower porosity and higher compressive strength in the hardened cement. Finer fly ash yielded greater compressive strength than coarser ash, as its smaller spherical particles contributed to denser and firmer structures. The presence of calcium minerals, from both Ordinary Portland Cement (OPC) and high-calcium fly ash, bolstered the strength of hardened products. Moreover, calcium minerals like CaO, Ca(OH)2, and CaSO4 were found to induce ASR expansion by promoting gel formation, leading to later-stage expansion in the hardened cement or concrete. However, finely milled fly ash as a precursor significantly reduced ASR expansion in AAMs, by approximately 40% compared to ordinary Portland cement. This study provides valuable insights for civil engineers for better understanding of AAM behavior and makes contributions to the safety and sustainability of cement and concrete systems.http://www.sciencedirect.com/science/article/pii/S2214509523007751Alkali activated materialCompressive strengthExpansionFly ash |
| spellingShingle | Artith Wongpaun Weerachart Tangchirapat Teewara Suwan Mizi Fan Factors affecting compressive strength and expansion due to alkali-silica reaction of fly ash-based alkaline activated mortar Case Studies in Construction Materials Alkali activated material Compressive strength Expansion Fly ash |
| title | Factors affecting compressive strength and expansion due to alkali-silica reaction of fly ash-based alkaline activated mortar |
| title_full | Factors affecting compressive strength and expansion due to alkali-silica reaction of fly ash-based alkaline activated mortar |
| title_fullStr | Factors affecting compressive strength and expansion due to alkali-silica reaction of fly ash-based alkaline activated mortar |
| title_full_unstemmed | Factors affecting compressive strength and expansion due to alkali-silica reaction of fly ash-based alkaline activated mortar |
| title_short | Factors affecting compressive strength and expansion due to alkali-silica reaction of fly ash-based alkaline activated mortar |
| title_sort | factors affecting compressive strength and expansion due to alkali silica reaction of fly ash based alkaline activated mortar |
| topic | Alkali activated material Compressive strength Expansion Fly ash |
| url | http://www.sciencedirect.com/science/article/pii/S2214509523007751 |
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